Polyacrylonitrile fiber duplex metal complexes catalyst and preparation method thereof

A polyacrylonitrile fiber and catalyst technology, applied in the direction of organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of popularization and application, poor reusability, and applicability No high-level problems, to achieve the effect of simple process, high reuse rate and low cost

Inactive Publication Date: 2009-02-11
TIANJIN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the Fenton oxidation method also has technical problems in its application: it must be used under acidic conditions (pH=2-5), and after the reaction is completed, iron ions will remain in the solution, causing secondary pollution
Studies have shown that although the catalyst can promote the oxidative degradation reaction of dyes in water, its applicability under alkaline conditions is not high, and its reusability is poor, which affects the popularization and application of this technology

Method used

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  • Polyacrylonitrile fiber duplex metal complexes catalyst and preparation method thereof
  • Polyacrylonitrile fiber duplex metal complexes catalyst and preparation method thereof
  • Polyacrylonitrile fiber duplex metal complexes catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Pretreatment of polyacrylonitrile fiber: Wash the polyacrylonitrile fiber yarn with nonionic surfactant JFC aqueous solution containing volume concentration of 2.0g / L for 30 minutes, take it out, wash it twice with water, and dry it for later use.

[0035] 2. Modification reaction of polyacrylonitrile fibers: Accurately weigh the above-mentioned pretreated polyacrylonitrile yarns to a specified weight, and immerse them in hydrazine hydrate with a volume concentration of 30g / L and hydroxylamine hydrochloride with a volume concentration of 42g / L. In the mixed aqueous solution, the bath ratio (referring to the ratio of the weight of the fiber used to the volume of the mixed aqueous solution) is 1:40, and the pH value of the mixed aqueous solution is adjusted to 9.5 with sodium hydroxide, and then reacted at 98°C under stirring conditions After 2 hours, the light yellow modified polyacrylonitrile fiber was taken out, washed repeatedly with distilled water for 3 times, and...

Embodiment 2

[0040] The volume concentration of the mixed aqueous solution of hydrazine hydrate and hydroxylamine hydrochloride in Example 1 is adjusted to 25g / L and 55g / L respectively, and the pH value is adjusted to 9.2; the molar concentration ratio of iron ion and copper ion in the metal ion mixed solution Adjusted to 3:1, that is, the volume concentration of the ferric chloride aqueous solution and the copper sulfate aqueous solution are 0.075mol / L and 0.025mol / L respectively, and the rest are the same as in Example 1, that is, the second polyacrylonitrile fiber bimetallic complex catalyst is prepared (Denoted as PAN-Fe-Cu-2).

[0041] Through measurement and calculation, the contents of iron ions and copper ions in the catalyst are 25.84mg / g and 11.91mg / g respectively.

Embodiment 3

[0043] The volume concentration of the mixed aqueous solution of hydrazine hydrate and hydroxylamine hydrochloride in Example 1 is adjusted to 45g / L and 40g / L respectively, and the pH value is adjusted to 9.8; the molar concentration ratio of iron ions and copper ions in the metal ion mixed solution is adjusted It is 1:3, namely ferric chloride aqueous solution and copper sulfate aqueous solution volume concentration are respectively 0.025mol / L and 0.075mol / L, all the other are with embodiment 1, promptly prepare the 3rd kind of polyacrylonitrile fiber bimetallic complex catalyst ( Recorded as PAN-Fe-Cu-3).

[0044] Through measurement and calculation, the contents of iron ions and copper ions in the catalyst are 11.69mg / g and 27.52mg / g respectively.

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Abstract

The invention relates to a polyacrylonitrile fiber bimetallic complex catalyst and a preparation method thereof. The catalyst is characterized in that the appearance is between brownish yellow and yellowish green and is fiber-shaped; and the catalyst is formed by polyacrylonitrile fiber which is modified by hydrazine hydrate and hydroxylamine hydrochloride, and a coordination compound of iron ion and copper ion, wherein, the contents of iron ion and copper ion are 11.60mg / g to 26.10mg / g and 11.15mg / g to 28.30mg / g respectively. The preparation method adopts the following steps: 1. the pre-treatment of the polyacrylonitrile fiber; 2. modified reaction of the hydrazine hydrate of the polyacrylonitrile fiber and hydroxylamine hydrochloride; 3. the preparation of mixed solution of iron ion and copper ion; 4. the coordination reaction of the modified polyacrylonitrile fiber and metal ions; therefore, the fiber-shaped polyacrylonitrile fiber bimetallic complex catalyst with the color between brownish yellow and pale green is obtained. The catalyst has good catalytic activity, is applicable to the degradation of dyes in the basic printing and dyeing wastewater and has high reuse rate.

Description

technical field [0001] The invention relates to a chemical catalyst technology, specifically a polyacrylonitrile fiber bimetallic complex catalyst used to promote the degradation of dyes in printing and dyeing wastewater and its preparation method. The international patent main classification number is proposed to be Int.Cl.B01 J 29 / 00(2006.01)I. Background technique [0002] The textile industry is one of the departments that discharge a large amount of industrial wastewater in my country. According to incomplete statistics, the textile industry discharges nearly 1 billion tons of wastewater every year, ranking sixth in my country's industrial wastewater discharge, of which printing and dyeing wastewater accounts for about 80% of the textile industry's wastewater discharge. Therefore, it can be seen that the environmental pollution problem of the textile industry is mainly the pollution of printing and dyeing wastewater. In addition, in the printing and dyeing process, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/06C02F1/72
Inventor 董永春韩振邦杜芳刘春燕
Owner TIANJIN POLYTECHNIC UNIV
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